Apparatus for delivering measured doses op powdered or granular



G HAAS APPARATUS FOR DELIVERING MEASURED DOSES OF Aug. 27, 1929.

POWDERED OR GRANULAR SUBSTANCES Filed Nov. 29, 1927 Patented Aug. 27, 1929.

UNITED ASTATES PATENT orifice.

G-USTAV HAAS, OF FRANKFOFJT-llTlZE-1vTAIN, GERMAY, ASSIGNOR T0 GENERAL ANILINE WORKS, INC., F Nlili "ESSEX, N. Y., .A CGRFOR-JIEICDN 0E? DELJ.\VJ`.RE.

APPARATUS FOR DELIVERING' FIEASRED DOSES OF POWDERED OR GRAIT'LAR SUBSTANCES.

Application iled November 29, 1927,` Serial No. 236,564, and in Germany December 1, 1926.

The present invention relates to an apparatus for delivering measured doses ol' powdered or granular substances particularly such of low mobility by means et a measur- 5 ing chamber corresponding to the volume ot the desired dose.

If substances of low mobility, as for instance coloring-matters, are to be dosed7 the difficulty arises that the material to be dosed 10 does not automatically glide into the s ice wherein it is to be dosed, but that it must be forced into this space by shaking; and knocking which very often causes the formation of either clods or hollow spaces within the said space so that a s; 'actory dosing is rendered impossible. For this reason substances of the said kind are in most cases dosed by weight7 in spite ot the iact that this method of dosingr requires machines ot a very complicated construction.

By the apparatus which constitutes the subject matter of my invention and the object of which is to obtain doses measured by volume7 it is possible to dose even substances of low mobility.

The accompanying drawing illustrates one modification of an apparatus which has proved to be very suitable for delivering measured quantities ot dyestuiis. Figures l to 4 show a vertical section of the apparatus as it appears in different stages of operation. Figure 5 shows a horizontal section on the line A-B of Figure l.

The apparatus comprises a hopper c, the upper wider part of which is open, but which may be closed, if desired, and the lower narrower end of which is open. To this lower end ot' the hopper is directly attached the dosing chamber proper b, which is provided 40 near its lower end with a sliding plate f or a similar device. In the center ot the hopper a, containing the material to be dosed, is a guide channel formed by walls c which are iiXed to opposite walls of the hopper a, as shown in F igure 5. In this guide channel are pistons all, Z2 and cl3, which are capable of up and down movement. The central piston (Z1 is capable of moving independently of side pistons Z2 and (Z3. Elastic blades el are attached to the lower end of piston d1 and elastic blades e2 and c3 are attached to the lower ends of pistons Z2 and cl3, respectively. These blades el, e2 and e3 are normally bent so that when forced out of the guide channel they spring out into contact with the side walls oft the dosing chamber Y).

The two blades c1 thus sever the material to be dosed while blades e2 and e3 serve to hold back the material in the hopper and relieve the blades el if' the weight of the said material. It is to be understood, however, that the blades e2 and e3 and attached pistons Z2 and d.; are not absolutely necessary and may be omitted. By Jfurther forcing the piston d, downwards and simultaneously opening the lower slide-shutter f ot the dosing--chaiiiber, the separated material is forced out of the dosing-chamber. After the dosingv chamber has been closed by the lower slide-shutter the piston all is again drawn upwards7 which causes the bent separating blades to return into the guide channel and to be again straightened therein, w ieieupon a fresh quantity ot' the material to be dosed can drop into the dosing-chamber. The movement of the pistons and the opening` of the dosing-chamber can be ettected either by hand or by mechanical means. The volumetric capacity of the apparatus may be adjusted in the known manner7 for instance by displacing the walls of the dosing-chamber. The apparatus may also be provided with other devices commonly applied in dosing-apparatus, for instance with a storage chamber.

It is not necessary to lit the guide channel and pistons in the center of the hopper a; they can also be fitted laterally to the center but in such a manner that they run towards the dosing chamber in a vert-ical line. .A worm-conveyor or a shovel may be mounted above the hopper tor conveying the material to be dosed into the hopper, and they may serve at the same time to prevent the material from clogging'. One of the sides ol' the dosing-chamber is made of glass plates g as shown in Figure 5 so that one can easily watch how the dosing` proceeds and any formation of clods or hollow spaces in the dosing-chamber may be observed and redressed.

Figure 1 of the accompanying; drawing shows the drawn up piston with the lower blades e1 c2 c3. When the piston and blades are in this position, the material can drop from the hopper into the dosing' chamber.

Fi gure 2 shows the blades when they have left't-he guide channel c and are bent owing to their elastic property, the upper blades e2 e3 serving to keep back the flowing material, while the blades el serve to sever the measured dose. rlhe Sldeehutter f provided at the lower part of the dosing-chamber already partly opened and allows the dosed material to drop into the receptacle.

Figure 3 shows the blades el when they have reached their end position and the dosed material has been entirely forced into the receptacle to be filled, the slide-shutter f being entirely drawn eut so as te open the chamber.

Figure l. shows the slide-shutter f closing` the chamber, all the blades having' returned into the guide channel so that the material to be dosed can again drop inte the deSingchamber.

I claim:

1. An apparatus or'delivering measured doses of powdered or granular substances comprising in combination a hopper, a dosinfr chamber directly attached to the lower end of the hopper, a vertical guide channel fitted in the center o'tl the hopper above the dosing' chamber, a piston within the guide channel capable of up and down movement therein, Said piston being provided at its lower end with two elastic bladen so bent as to be capable when forced downward out of the guide channel of springing' out in opposite directions horizontally across the width of the dosing chamber into contact with the walls thereot`r and a suitable sliding` plate at the lower end of the dosing' chamber capable oi opening' and shutting the same.

2. An apparatus as claimed in claim 1 haring three pistons side by Side within t-he guide channel, the central piston beine; such as claimed in claim 1 and the two side pietons each having` an elastic blade such as claimed in claim 1.

ln testimony whereof, I aflix my signature.

GUSTAV HAAS, Apotheker. 

